package com.itheima.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.common.BaseContext;
import com.itheima.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.ws.WebFault;
import java.io.IOException;

/*检查用户是否完成登录
*
* */
@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
      //路径匹配器
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request =(HttpServletRequest) servletRequest;
        HttpServletResponse response=(HttpServletResponse) servletResponse;

        //获取本次请求的url
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}",requestURI);
       //定义不需要处理的请求路劲
        String[] urls= new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };

        //判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //如果不需要处理，直接放行
        if (check){
            log.info("本次请求不需要处理 {}",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //判断登录状态，如果翼登录，则直接放行
        if(request.getSession().getAttribute("employee")!=null){
            log.info("用户一登陆，用户id为 {}",request.getSession().getAttribute("employee"));
           long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.serCurrentId(empId);
            long id=Thread.currentThread().getId();
            log.info("线程id为：{}",id);

            filterChain.doFilter(request,response);
            return;
        }
        //判断登录状态，如果翼登录，则直接放行
        if(request.getSession().getAttribute("user")!=null){
            log.info("用户一登陆，用户id为 {}",request.getSession().getAttribute("user"));
            long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.serCurrentId(userId);
            long id=Thread.currentThread().getId();
            log.info("线程id为：{}",id);

            filterChain.doFilter(request,response);
            return;
        }
        log.info("未登录");
        //如果未登录，返回登录状态
       response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }

    /*
    路径匹配，检查档次请求是否需要放行
    * */
    public boolean check(String urls[],String requestURL){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURL);
            if(match){
                return true;
            }
        }
        return false;
    }
}
